100% coolant is ok for a top-off, but don't use it straight if you have to add a lot. Did they bother to check WHY the coolant was low? It doesn't just evaporate. The system has a dozen plastic bits and pieces that are prone to leaking. Doesn't sound like they did you any favors.
And come on, that symbol is one of the most common symbols among all car brands. I'm not trying to flame or bitch, but seriously, that's pretty much the universal coolant symbol.
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RRT
E92 335i/6MT with stuff and things
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